<h2>Gallery</h2>
    <div class="cat">
        Audio
    </div>
    <div class="cat">
        Video
    </div>
    <div class="cat1">
    <div class="photo">
        Photo1
    </div> <div class="photo">
        Photo2
    </div> <div class="photo">
        Photo3
    </div> <div class="photo">
        Photo4
    </div>
        <div class="photo">
        Photo1
    </div> <div class="photo">
        Photo2
    </div> <div class="photo">
        Photo3
    </div> <div class="photo">
        Photo4
    </div>
    </div>
   
